This isn't really a direct answer, it's just hand waving. I'm not sure how you're qualifying "ten times worse" and without pointing to specific scenarios it's impossible to verify the responses or non-responses to them.
The real answer is that these boats are not flying national flags. That makes it legal under maritime laws that have been in place for hundreds of years. If you are watching a news source that doesn't mention this, you are consuming propaganda. BTW, this line of propaganda about lack of rule of law is dangerous. Seriously, you should stop it.
Show the law where not flying a flag means you can blow up a ship. I see plenty of boats every day not flying flags. They could be smuggling drugs. Why not explode them too?
You keep arguing that not displaying a falg is justification for killing people. This is bullshit. It's justification for interdicting a vessel but not for simply blowing it up.
